listcategories error

[Willie30F]

Hey there, I'm getting this error since a few days when I want listcategories using console, either in-game or rcon, it doesn't matter. It worked fine before, but doesn't anymore.
The server is running linux and the latest game & uMod/Oxide version.

Failed to call hook 'ListCategoriesCommand' on plugin 'StackSizeController v3.4.3' (KeyNotFoundException: The given key was not present in the dictionary.)
  at System.Collections.Generic.Dictionary`2[TKey,TValue].get_Item (TKey key) [0x0001e] in <eae584ce26bc40229c1b1aa476bfa589>:0
  at Oxide.Plugins.StackSizeController.ListCategoriesCommand (Oxide.Core.Libraries.Covalence.IPlayer player, System.String command, System.String[] args) [0x0003d] in <1457ea$
  at Oxide.Plugins.StackSizeController.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x010c8] in <1457ea52993c4a34acc5d32eb52779a5>:0
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <31122a27a2414cd799150f8677cf39d4>:0
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <c2afd8354b8b4f3ca451cf5a1aa111c3>:0
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <c2afd8354b8b4f3ca451cf5a1aa111c3>:0
(Filename: ./Runtime/Export/Debug/Debug.bindings.h Line: 39)